Answer:
x = ±√11 +2
Step-by-step explanation:
Given in the question an equation,
x²- 4x - 7 = 0
Step 1
take 7 to the right side of equation
x²- 4x = 7
Step 2
To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of b, the coefficient of x
2ab = -4x
2xb = -4x
b = -2
Step 3
Take square of b and add it to each side of the equation.
x²- 4x + (-2)²= 7 + (-2)²
x²- 4x + 4 = 7 + 4
x²- 4x + 4 = 11
Step 4
Factor the perfect trinomial square
(x−2)² = 11
Step 5
take square root on both sides
√(x−2)² = √11
(x-2) = ±√11
x = ±√11 +2
Answer:
Explanation:
Given the expression:
This can be a difference of two squares like:
and this is:
<span>0.27 * 60 = Take the integer part only to get the minutes, then multiply the decimal part by 60 again to get the second</span>
The answer is 9.
This is a cube root.
9 cubed, or 9 the the third power, is 729
Recall to always convert the mixed fractions to "improper" fractions first,
